1218

1218 may refer to the year AD 1218 or to the integer 1218 itself. As a number, 1218 is a composite, even integer with the prime factorization 2 × 3 × 7 × 29. It has 16 positive divisors: 1, 2, 3, 6, 7, 14, 21, 29, 42, 58, 87, 174, 203, 406, 609, 1218. The sum of its divisors is 2880. In Roman numerals it is written MCCXVIII. In other bases, 1218 equals 0x4C2 in hexadecimal, 10011000010 in binary, and 2302 in octal. It is not a prime, a square, or a cube, and its divisors reflect its four distinct prime factors.

1218 as a year refers to the year 1218 CE in the Julian calendar. It was a common year with 365 days, occurring during the High Middle Ages, a period characterized by the growth of centralized monarchies, theological scholarship, and ongoing regional conflicts across Europe and Asia. Because the year spans diverse historical contexts, a single global event does not define it; instead, regional chronologies document developments in kingdoms, churches, and trade networks typical of the era.

In summary, 1218 is a four-prime-factor composite number with multiple small divisors and standard representations in several numeral systems, and it also marks a year in the 13th century within the pre-Gregorian calendar framework.